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Mantra Coat IOR

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I've been trying to replicate something similar to Arnold's coat IOR parameter in Mantra. Ideally I'd like to be able to control how much of a coat layer is visible depending on facing angles without affecting the underlying surface, even if this involves breaking the law of conservation of energy.

Any ideas on where I could start?




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I've found a way to do it! 

There's an index of refraction parameter for the coat only if you jump inside the principled core shader inside the principled shader and locate the coat_reflection (PBR Non-Metallic) shader


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