 Surfaces that undergo chemisorption generally result in more extensive reconstructions than those that undergo physisorption, as the breaking and formation of bonds between the surface atoms alter the interaction of the substrate atoms as well as the adsorbate.Different reconstructions can also occur depending on the substrate and adsorbate coverages and the ambient conditions, as the equilibrium positions of the atoms are changed depending on the forces exerted.One example of this occurs in the case of In (indium) adsorbed on the Si (111) surface, in which the two differently reconstructed phases of Si(111)formula_1-In and Si(111)formula_2-In (in Wood's notation, see below) can actually coexist under certain conditions.