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Adds an iridescent thin film layer over a microfacet base BSDF. This must be layered over another base BSDF using a MtlX Layer VOP, as the node is a modifier and cannot be used as a standalone BSDF.
Thickness of the thin film layer in nanometers. Default is 550 nm.
Index of refraction of the thin film layer. Default is 1.5.