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Planar displacement condition imposed in the body layer only: (a) modal frequencies as a function of stiffness ratio; (b) normalized modal frequencies with the planar displacement value as unity (mode 7 omitted). (—–) mode 1; (---) mode 2; (-·-·-) mode 3; (·····) mode 4; (—) mode 5; (---) mode 6; (-·-·-) mode 7.
