Surface instability and wrinkling pattern evolution on a fluid-supported inhomogeneous film You-Jun Ning, Zheng-Cai Zhang, Bin Gu, Alamusi and Fei Jia Eur. Phys. J. Plus, 132 4 (2017) 170 Published online: 13 April 2017 DOI: 10.1140/epjp/i2017-11448-2