elastomeric substrate of PDMS Critical strain for buckling (0.034% for si ) [ E PDMS =2MPa , E Si =130GPa , v ... PDMS =0.48, v Si =0.27] Depends on the elastic moduli . For a relatively thin substrate, local ... Flexible and Stretchable Dept of Electronic materials Eng. Kwangwoon Univ .2 contents 1. Background