The (100) surface was studied after various annealing treatments. The reconstructed phases included coexisting (2 x 2) and (1 x 8) phases, after high-temperature (above 950K) annealing followed by quenching. Half-order streaks revealed the presence of the (2 x 1) phase after low-temperature (below 950K) annealing. The transition from the metastable (2 x 2) and (2 x 8) phases to the stable half-order streak was reversible. The distribution of kinks and missing-dimer defects was expected to be the main cause of the reconstructions.

Y.J.Lee, S.Kim, C.S.Hwang, C.Lee, C.Hwang: Physical Review B, 1994, 50[15], 11204-7