  The in-situ growth of superconducting MgB2 thin films was examined from
various perspectives. The paper discusses (1) growth temperature, (2) the
effect of excess Mg, (3) the effect of residual gas during growth, (4) the
effect of in-situ annealing, (5) thickness dependence and (6) the effect of
substrates. Our results provide a guide to the preparation of high-quality
superconducting MgB2 films for potential electronics applications.
