Fig. 1. Schematic diagram of electromagnetic waves incident on multilayer materials. For the Nth layer materials located at a distance r, the incident electric field is EI,E1,E2,⋯,EN, the reflected electric field is ER,E′1,E′2,⋯,E′N, the transmitted electric field is ET. Here, d represents the thickness of material, and k is the propagation direction.
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