This is the image I posted above. The basic Cycles node arrangement is highlighted within the yellow box.

The PrincipledBsdf node is the most convenient way to set up using Cycles, although the conventional Cycles without it still works fine. This is a set of additional nodes to introduce ambient occlusion, not a separate layer. I copied this straight from Blender and reproduced it in Poser. If you only use Cycles without the PoserSurface or PhysicalSurface nodes present and connected to an image map, the preview will appear black because of the ambient occlusion node. It will render fine in Superfly. I introduced an on/off switch in one of my setups, but it didn't affect the preview display; everything remained black. My suggestion: set up your scene without ambient occlusion connected, then activate it afterwards. Otherwise, keep the PoserSurface root node with an image map connected in the materials and activate the Cycles Superfly root when ready to render. If you have any questions or problems, let me know.