Last time I shared my workflow on how I create most of the materials with Physical render in Cinema 4D. If I briefly recap, I use Reflectance channel within which I create two layers, diffusion that uses Lamberitian type of reflection and Reflection layer with GGX or Beckmann reflections. I load my diffuse/Albedo map in layer color section of Diffuse. In the C4D help files they recommend that you use textures map in color channel, but I like it better if I load them in Reflectance, because you get better result and you can actually go back to "color" look pretty simply - you just decreases the reflection and increase specular strength in the same layer.
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