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Absi'ruct-The surface resistance R(T,o) at 10 and 145 GHz is obtained experimentally between 4 and 300 K. In the temperaiture range Ta I T I Tc R(T) is quantitatively fitted by the BCS theory with a mean free path !(T) increasing exponentially below Tc. The e (T)-increase is related to diminishing plane-chain scattering and is limited at Ta by 'inelastic surface scattering' at weak or strong links, e.g., at twin boundaries of an average distance a T w They dominate scattering for C(T) 2 a~~/ 2 . Below Ta the enforced energy transfer from YBCO-crystallites to weak links enhances R(T

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