Since the discovery of high-temperature superconductivity in copper-based oxides (cuprates), there has been a sustained effort to understand its origin and to discover new superconductors based on similar building principles. Indeed, superconductivity has recently been discovered in the doped rare-earth nickelate Nd:0.8:Sr:0.2:NiO:2:. Undoped NdNiO:2: is the infinite-layer end member of a larger family of layered nickelates, which can be explored by molecular-beam epitaxy (MBE).