Buckling and layering transitions in confined colloids D. K. Satapathy, K. Nygård, O. Bunk, K. Jefimovs, E. Perret, A. Diaz, F. Pfeiffer, C. David and J. F. van der Veen EPL, 87 3 (2009) 34001 Published online: 26 August 2009 DOI: 10.1209/0295-5075/87/34001