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The dielectric functions of composite moterials consisting of heelectron-type metal particles CAg or Cu) and a dielectric host material with e, = 1.0, 2.99 or 6.0 a~ calculated using the Maxwell-Cmett model. These function present an anomalous region when the interband bansitions of the metal particles occur at frequencies above the resonance frequency (7xh = -em), In this case the Lorenb osallator model is used to malyse the optical behaviour of the composite material. The Lorentz parmeters are calculated and discussed.

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