Fig. 1

LEED patterns of (a) uncovered Fe(110) and (b) CoO(111)/Fe(110) surfaces. Corresponding ball models of (c) Fe(110) and (d) CoO(111)/Fe(110) surfaces. The relative Fe and CoO in-plane directions as concluded from the LEED analysis are sketched in (e). The thicknesses of Fe and CoO layers are 90 Å and 30 Å, respectively.