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The Layered Impedance Boundary Condition is based on the assumption that in the thin layers and in the substrate the wave propagates essentially in the normal direction. Thus, the wave could be incident in the normal direction or the wave could be refracted to propagate in a direction close to the normal direction. The latter condition is fulfilled for a good conductor.
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For a general Layered Material, added through a Layered Material Link or a Layered Material Stack, the Thickness is set in the Layer Definition section of the Settings window. Several layers may be defined in the table, and the Thickness should be defined for each of them. The total thickness of the Layered Material is the sum of all the layers thicknesses.
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When the Layered Material is a Single Layer Material, the Thickness is set in the Material Contents section in the Settings window. Alternatively it can be set in the Layer Definition section of the Shell property group Settings window.
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In a Material node, the layer Thickness is set in the Material Contents section by adding a Shell property group from the Material Properties section in the material Settings window. This automatically adds a Shell subnode under the Material node, transforming it into a Layered Material.
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Enhanced Coating for a Microelectromechanical Mirror: Application Library path Wave_Optics_Module/Optical_Scattering/enhanced_mems_mirror_coating demonstrates how to set up the Layered Impedance Boundary Condition to represent a metal mirror with a thin-film coating.
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