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Using Radiance to generate solar surface gain schedules

Hi all, From my understanding I need values for absorbed radiation in both opaque ( using the SurfaceProperty:SolarIncidentInside object) and transparent elements (using the ComplexFenestrationProperty:SolarAbsorbedLayers object) .Although it is straightforward to calculate solar gains on the inside face of walls, ceiling and floor I am a bit confused about how to calculate absorbed radiation on each layer of the glazing system since we model windows as single surface in Radiance.

Regards, Kostas