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. 2021 May 17;21(10):3490. doi: 10.3390/s21103490

Figure 13.

Figure 13

When shear waves dominate the resonator’s response, the QCM response is surface-specific. Flexural admixtures to the mode of vibration and the concomitant compressional waves may spoil surface specificity. Compressional waves may be reflected somewhere in the bulk and return to the crystal.