Si(1 1 0) surfaces covered with small amounts of In deposit and then annealed at high temperature were investigated by RHEED, and two kinds of superstructures with A = 3a and B = -a + 4b, and A = 3a - 2b and B = -2a + 4b as primitive translational vectors are reported to form on the surfaces. (C) 2009 Elsevier B. V. All rights reserved.