Low-cost hydrophobic layer as a top plate in two-plate digital microfluidics Ghiasadin Tabatabaeipour, Hassan Hajghassem and Mansoor MohtashamiFar Eur. Phys. J. Appl. Phys., 71 1 (2015) 11101 Published online: 23 July 2015 DOI: 10.1051/epjap/2015150238