If you want a ready-made Firefly shader for three layers with lots of Blender nodes have a look at my Poser-Shader-For-S.E.Asian-Shields ShareCG freebie from 8 years ago. It included a generic three layer shader.

But remember to put on your peril-sensitive sunglasses before looking at the shader network...

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.

*also available in ShareCG, DAZ, and CGBytes flavours.