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Electronic Properties of Ag Monolayers on (111) Cu

The growth of Ag monolayers on (111) Cu, studied by Auger electron spectroscopy and surface reflectance spectroscopy, follows the layer-by-layer mode. The Ag monolayer in contact with Cu displays a narrow absorption band at 3 eV, which is interpreted as due to transitions from d states in the Ag monolayer, the shift being caused by the interaction with the Cu substrate. The electronic properties of thicker Ag films gradually tend to those of bulk Ag.