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The model structures of simulation program. (a) the substrate layer (I) is 36Y-90X quartz, the metal layer (II) is gold, the additional material layer (III) is the protein layer and the liquid layer (IV) is water or a buffer; (b) The substrate layer (I) is 36Y-90X quartz, the metal layer (II) is gold and the liquid layer (III) is a glycerol-water mixture.
