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Line-focus acoustic microscopy has been used to measure the phase velocities of surface acoustic waves on bare MgO and bare LaAlO/sub 3/, and on Nb/sub 2/O/sub 5//MgO and BaTiO/sub 3//LaAlO/sub 3/ thin-film/substrate configurations. The thin films are polycrystalline materials. The substrates are anisotropic single-crystals. The measured angular variation of the surface acoustic wave velocities has...
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