We have constructed and solved an overlayer island growth model in which the distribution of the islands obeys an ‘‘extended geometric distribution function.’’ This model describes quantitatively the growth of oxygen p(2×1) islands on a W(112) surface as the coverage is increased from 0 to 1. The average size of the islands is seen to increase sharply as the coverage approaches 1/2 monolayer, which is an indication of the coalescence of the overlayer islands.

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