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The PML regions of two physics (or two different material models) are adjacent and in contact. In this case, a single PML feature should be used for the two PML domains. Set the Typical wavelength from to User defined and enter a value based on the longest wavelength. For example, for an air-steel system enter: 5770[m/s]/freq
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The PML regions of two physics (or two different material models) do not touch. In this case, use one PML feature for each PML domain. Keep the default setting of Typical wavelength from to Physics interface and select the relevant physics interface under Physics.
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See the Acoustic-Structure Interaction with a Perfectly Matched Layer (PML) model in the Application Gallery on the COMSOL website. It is located here: https://www.comsol.com/model/acoustic-structure-interaction-with-a-perfectly-matched-layer-pml-23521
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