Pd–In thin films of various compositions were electrochemically deposited on brass substrates. Their mechanical properties (hardness and indentation modulus) were then determined using Nanoindenter G200 (Keysight Technologies) equipped with a sharp Berkovich tip. The main goal was to assess the effect of chemical and phase composition, as well as structure of the films, on the mechanical properties (indentation hardness and modulus) of the investigated Pd–In thin films regardless of the difference in the thickness and the significance of the surface roughness. It has been demonstrated that the mechanical properties of these films are highly compositionally sensitive, and the surface roughness yields scatter in the results and introduces uncertainty in the obtained mechanical characteristics.

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