  The discovery of superconductivity in infinite-layer nickelates has attracted
much attention due to their association to the high-$T_c$ cuprates. Cuprate
superconductivity was first demonstrated in bulk samples and subsequently in
thin films. In the nickelates, however, the situation has been reversed:
although surging as a bulk phenomenon, nickelate superconductivity has only
been reported in thin films so far. At the same time, the specifics of
infinite-layer nickelates yield distinct interface and surface effects that
determine their bulk vs thin-film behavior. In this paper, we provide an
overview on these important aspects.
