For example, Caisson has a complete thread only on PrincipledBSDF. Using Poser13, you will find new options and possibilities added to the node, but reading this thread, you'll get a huge idea of what's possible:

https://www.renderosity.com/forums/threads/2954649/principled-bsdf-some-examples

𝒫𝒽𝓎𝓁

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