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Nanoindentation is a very efficient tool to measure local mechanical properties of materials. In general in homogeneous materials the mechanical properties can be extracted from the force-indentation depth curve using Hertz’s contact solution. In the presence of an interface separating materials with different mechanical properties as for example in composite materials, Hertz’s solution is no longer valid. This tool calculates the indentation depth versus applied force for a spherical indenter in the proximity of an interface.