Don't know how he achieved this effect and in which software. There is free demo set of textures, I was curious if someone use it i Maxwell.
I have only little experience with multi-layered displacement materials so need help here
HP Z620 Win 10 64+
MBPro Retina 15" (2016), Intel Core i7 2.9 GHz, Radeon Pro 460 4GB, macOS Sierra
ArchiCAD 21 INT/POL, Maxwell Render 3.2/4