Spontaneous formation and spin of particle pairs in a single-layer complex plasma crystal V. Nosenko, S. K. Zhdanov, H. M. Thomas, J. Carmona-Reyes and T. W. Hyde EPL, 112 4 (2015) 45003 Published online: 01 December 2015 DOI: 10.1209/0295-5075/112/45003