PBR Layers is a shader node system which makes it quick and easy to create and mix PBR material layers in Blender3D.
Your PBR textures are grouped together in a single node representing all the textures of the set and with built in Scale, and Height control inputs.
There are 2 types of PBR Mix node, simple Mix and Height Mix. The Mix nodes can be used to blend between Layer nodes and other PBR Mix nodes.
To finalize the material, the PBR to Principled node automatically connects your PBR network to a final Principled node.