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Representative master curves for (A) STIFF or SOFT inclusion of a 3 μm top layer indented with a 25 μm spherical indenter; (B) STIFF inclusion of a 3 μm top layer using a 10, 15, or 25 μm spherical indenter; and (C) STIFF inclusion of a 3, 4, or 5 μm top layer using a 25 μm spherical indenter.
