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Strain relaxations of a p(1x2) ordered oxygen layer on W(110) are measured asa function of temperature across the disordering transition using low-energyelectron diffraction. The measured strains approach values of 0.027 in the[1-10] and -0.053 in the [001] direction. On the basis of the measured strainrelaxations, we give quantitative information on temperature-dependent surfacestress using the results of ab initio calculations. From the surface formationenergy for different strains, determined by first-principles calculations, weestimate that surface stress changes from -1.1 for the ordered phase to -0.2N/mfor the disordered one along [1-10], and from 5.1 to 3.4 N/m along [001].Moreover, our observation that the strains scale inversely with domain sizeconfirms that the strain relaxation takes place at the domain boundaries.

Temperature dependence of surface stress across an order-disorder transition: p(1x2)O/W(110)