In Brillouin-light-scattering studies of a series of Ag/Pd superlattice films we have observed scattering from longitudinal guided modes (LGMs) whose velocities are determined primarily by the c₁₁ elastic constant. From the measured velocity of the first-order LGM, we have obtained the first accurate determination of c₁₁ for metallic thin films. For the Ag/Pd superlattice films, large increases in both the longitudinal (c₁₁) and shear (c₅₅) elastic constants were observed as the superlattice modulation wavelength {Λ} was decreased below {Λ}=60 {}.
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Dutcher et al. (1990) studied this question.
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