I'm building a 3 foot block retaining wall, have a 2 foot wide, 2 foot deep footing dug.
How many horizontal pieces of rebar should be in the footing and where should thet be placed?

Where do you live and do you know how deep your fost line is in your area?

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2 foot wide, 2 foot deep footing dug

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Also what is the Psi you are pouring?

What size Block are you going to use? 10s 12s And don't think 8s

If there is not a spec there in code for the footer I always use 3,500 Psi for the footers. Also I pour 8" thick footers which also makes it easier to to use 8" increment's for height termination. Also slant the wall to wards the bank. Get back on what your plans are for backfill and weep or drainage. And the bank preparation there now which will need to be addressed before the pour in back slope.

I wouldn't bother with any horizontal ties. It's a tiny wall. Two parallel runs the length of footer with 3/8 or 1/2 bar. That will hold that footer together. New house here very rarely use rebar in a footer. And it gets below 0 degrees here. The footers here are 3" deep min. Check your local codes on depth and rebar. It may not pertain to your wall since its not really consider a structural build. At least not here. If some extra reabr left burn it up for cross ties or save for a rainy day

A glorified landscape timber.

Southern California, no frost !

The depth is good but what size block are you going to use? And being no frost rebar or not won't make a big difference here. The wall will fail before a footer problem. How long is the wall?

4 ft. high, 14 ft. long between a garage and another existing wall, using 6X6X16 slump stone.

[QUOTE=;][I'm building a 3 foot block retaining wall, have a 2 foot wide, 2 foot deep footing dug or is it 4 ft. high, 14 ft. long between a garage and another existing wall, using 6X6X16 slump stone. /QUOTE]
Which is it?

4 ft. high, 14 ft. long between a garage and another existing wall, using 6X6X16 slump stone.

As small as the wall is just two 14 foot long 1/2 rebar is fine. Its not a house you are building here its dry stacked block as far as I see. They will move no matter what. Footer is fine and no bar not a crime here. We build thousands of homes here with no bar in footers as long as its 8" thick and 24" wide.

The biggest issue is drainiage behind the wall and crushed stone backfill

I agree, I would not even bother with rebar. No frost and small size just doesn't warrant over building.