(165)

where ${J}_{1}$ is the Bessel function of the first kind and order 1, and ${H}_{1}^{\left(1\right)}$ is the Hankel function of the first kind and order 1. The summation is taken over all the symmetric, ${\xi }^{S}$, and antisymmetric, ${\xi }^{A}$, Lamb wave modes that exist at a given frequency ...

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