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Buckling of thin films on elastomeric substrates such as polydimethylsiloxane (PDMS) is the well-known phenomenon in buckling instability originating from moduli mismatch between a substrate and a thin film placed at the top.Recently,many studies on the microstructure created by the buckling have been reported but most of the work has dealt with mechanically homogeneous top thin films,which have constant Youngs moduli throughout the whole film area.