A structural requirement for high- T c (HTS) cuprates is the simultaneous presence in a layered structure of two different functional blocks, individually non-superconducting: the charge reservoir (CR) block and the infinite layer (IL) block. Artificially layered 2× m superlattices were grown, by pulsed laser deposition, stacking epitaxially m layers of (Ba 0.9Nd 0.1)CuO 2+ δ and two layers of CaCuO 2. Starting from superlattices with m=2, the thickness of CR block, namely the Ba–Cu–O block, which separates adjacent Ca–Cu–O IL blocks, was gradually increased up to m=10. In the superlattices with m>4 the superconducting layers are completely decoupled, showing, relative to the m=2 superlattice, a negligible decrease of the transition temperature and a strong increase of the anisotropy. Superconductivity at 55 K was found in both the ultrathin films, only consisting of two CR blocks sandwiching a (CaCuO 2) 2 layer, and the superlattices with thick CR blocks, demonstrating that the interlayer coupling in such heterostructures is unimportant. Moreover it has been shown that a single CaCuO 2 layer is still superconducting.