The microstructure and crystallographic texture of copper electrodeposited onto a graphite substrate were examined by scanning electron microscopy, and electron backscatter diffraction. A high twin fraction of 80% was achieved using a pulsed electrodeposition technique under the current density of 0.5 A/cm(2). A new twinning cluster, termed in this paper as "pseudohexagonal composite twins," was observed in pseudohexagonal grains. The pseudohexagonal composite twins possess the crystallographic feature of a rotation angle of 60 degrees around an axis of < 111 >. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3548497] All rights reserved.