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In this paper, we investigate the positive dispersive behavior of Rayleigh velocity for several layer/substrate combinations: Cr/quartz, SiO2/Mo, SiO2/stainless steel and Cr/Mo. The simulation conditions were those usually used in conventional acoustic microscopy. It was found that a second mode appears next to that of Rayleigh, unlike the usual unique dispersive curve. Moreover, this new mode has...
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