Abstract
We propose that in oxide superconductors there is a substantial difference between the degree of anisotropy in the single- and two-particle motion. This explains several recent experimental observations. The Cooper pairs are primarily made up of the electrons in the same Cu—O layer, but they have a significant chance of coherently hopping to the neighboring layer. Such a process arises through the interband scattering due to interactinos. This has important consequences for the phenomenology of superconducting and normal states.