Universality in shape evolution of Si1−xGex structures on high-index silicon surfaces J. K. Dash, T. Bagarti, A. Rath, R. R. Juluri and P. V. Satyam EPL, 99 6 (2012) 66004 Published online: 08 October 2012 DOI: 10.1209/0295-5075/99/66004