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We study the role of bulk-surface exchange in the diffusion of adsorbed molecules at liquid-solid and liquid-fluid interfaces. For ``strong adsorbers'' (readsorption time much less than desorption time) we find anomalous surface diffusion on time scales less than the surface retention time: Displacement moments grow as 〈r^q〉t^ (q), where (q) 0ex{0ex}=0ex{0ex}q for q1, and 〈r〉. This superdiffusive behavior arises because molecules execute L\'evy walks on the surface, mediated by the liquid bulk.
Bychuk et al. (Mon,) studied this question.