Figure 4
Densities of the different elements as obtained from RXR. Each vertical block represents the density of one atomic species within an atomic slice at a given distance from the interface, which is located at 0 UC on the abscissa. Note that the blocks of different species are overlapping, as the blocks always reach from 0 mol/cm\(^3\) to the actual density. For instance, for a SrO-layer only the Sr-block is visible, because it is on top of the O-block behind it. Models for room temperature (a) and at T = 11 K (b) are shown. The temperature dependence of the C-contamination layer can be attributed changes in the vacuum conditions upon cooling.
