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This paper presents the calculation of the reflectivity, transmissivity and optical constants of ultrathin Cu-Ni multilayer stacks using the characteristic effective medium approximation (CEMA) introduced in an earlier communication. Each of the Cu-Ni multilayer stacks has an identity period of 100 A, Cu - 45 A and Ni - 55 A. Calculations of the reflectivity and transmissivity are executed via the...