  Thin superconducting films are usually regarded as type II superconductors
even when they are made of a type I material. The reason is a strong
contribution of the stray magnetic field that stabilizes vortices. While very
thin films indeed reach this limit, there is a large interval of film
thicknesses where the magnetic properties cannot be classified as either of the
two conventional superconductivity types. Recent calculations revealed that in
this interval the system exhibits spontaneous formation of complex
condensate-field patterns that are very sensitive to system parameters, in
particular, the temperature and the applied magnetic field. The corresponding
superconducting magnetic properties can be attributed to a special regime of
the intertype superconductivity whose physical origin lies in the removal of an
infinite degeneracy of the self-dual superconducting state at the critical
Bogomolnyi point. Here we demonstrate that qualitative characteristics of the
intertype superstructures in thin superconducting films are independent of the
choice of the in-plane boundary conditions for the order parameter and the
magnetic field.
