“…AWs are generated and detected utilising an interdigital transducer coated with a 5000 thin-Ðlm PtM110N single crystal cold-welded on the propagation path of the Ó surface AW. 15 The IDT consists of a poled 128¡ Y-cut single-crystal substrate LiNbO 3 with an input and output aluminium electrode array capable of exciting Rayleigh waves. The centre frequency at room temperature (RT) is ca.…”