Polarization of cluster radio halos with upcoming radio interferometers F. Govoni, M. Murgia, H. Xu, H. Li, M. L. Norman, L. Feretti, G. Giovannini and V. Vacca A&A, 554 (2013) A102 Published online: 12 June 2013 DOI: 10.1051/0004-6361/201321403