Theoretical and experimental comparison of sensitivity of two non-destructive methods (SEWS and RAS) has proved that in the linear approximation for superthin films the sensitivity of SEWS is higher than RAS and is increasing with the increase of the relation '/')t; ( .I-film frequency absorption band, -collision frequency of free carriers in the metal).Experiment. All tests were done using IFS-113 (Bruker) fourier
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