Just to add to Simon's comments above.
Industry standard for veneer is 0.6mm.
China variants could well be less and certainly not more.
Also, the guitar body is sanded before it leaves the factory and the veneer could be much less than 0.6mm in places so be very careful or as Simon says, do not sand at all.
Once you know you have sanded too far it is too late.

Cheers
Ricky