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Seems like most of the mxm materials in the MXM gallery are "Maxwell Render version 1.x with version 2 material compatibility". These 1.x materials have several BSDF's under a single layer. Can these be used this way or do we need to add layers so than one BSDF is under each layer?

They work fine for BSDF's blended normally (not additively). You would get the same result if each BSDF was under a separate normal blended layer with the same layer weight as the original BSDF weights.

Thanks Brian.