What is the thickness specifications for resurfacing rotors?

Frizz, come on, man! Give a make and model, pa-leeeeze!

https://www.askmehelpdesk.com/cars-trucks/when-asking-about-your-vehicle-303903.html

Also on most rotors its stamped on them.and where ever you bring them to get them turned,they should measure the thickness,before starting. As stated depending on the year of the car it may be cheaper to just replace them,with new ones.