A mate got "conned" with imprinted concrete years ago. The firm sold it on the basis it could be applied down to I think 3mm thick and wouldn't crack due to "fibres". It came with a worthless X years guarantee.
The job was crap. Looked good for about a week. Bits of it came unstuck from the original concrete underneath. No recourse to the cowboys who did it of course.
When I did mine, above, the concrete was 3 or 4" thick with the pattern pressed into the top 1/2".