to the order of 10 -3 M atm -1 can lead the kinetic model fit results to have an excellent agreement with these kinetics data of binary STS at RH between 60% and 80%, such as the red lines shown in Figure . However, according to eq 1, this magnitude of K sol,O3 in the 3 of first six bulk layers vs. time. The surface layer is above the first bulk layer.