I took the famous Nefertiti OBJ with 2 million polygons, put a gradient on it to render a displacement map and put that map on a flat card in A:M.
Overhangs like behind the cheekbones and at the side of the nose are impossible to project off a flat card but overall I'm impressed at how the OpenEXR displacement map captures all the tiny details of the original OBJ.
full screen to see detail...
NeferTurnH_3K.mp4
The displacement map looks like this...