抄録
We have studied the thermal step bunching on the vicinal surface with adsorption statistical mechanically. We have obtained theoretically that, in the case of repulsive short-range interaction among adsorbates, the thermal step bunching occurs around the critical curve of the order-disorder phase transition on the surface which forms the 'terrace' in the vicinal surface. We will mention to the difference between the step bunched vicinal surface and the Herring's hill-and-valley structure.