I would like to pour a new 2" slab of concrete over an existing 1 year old 5" reinforced slab. The end use will have passenger weight vehicles on it.
Is 2" feasible?
If so what bonding proceedures do I need to take.
Thank you in advance for your valued advise.

First please tell us why you want 2" on top of an overly thick slab? What is the issue with the original slab?

No issue with the origonal slab. I want to anchore some frame pulling rails to the existing floor and want to add the additional 2" more for cosmetic appeal as well as to minimise these rails as a trip hazard.
See www.wedgeclamp.com for an over few of the product.

2" would be the bare minimum and I still think it will fail in fairly short order. Etch the old floor and use a bonding agent in the new mix. tell the contrete supplier what you are doing and they will "tune-up" their mix with more solids.