The impedance boundary condition is widely used in order to reduce a multiple region electromagnetic field problem to a magnetic field problem analyzed in a nonconducting region only. It is obvious that the solution to the latter problem is much easier to obtain than those for conducting regions. There are several versions of the impedance boundary condition formulation which depend mainly on the choice of a field state variable and the solution technique applied.
Gramz, M. and Ziólkowski, M. (1992), "ON THE USE OF THE IMPEDANCE BOUNDARY CONDITION WITH A ONE‐COMPONENT MAGNETIC FIELD FORMULATION", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 11 No. 1, pp. 25-28. https://doi.org/10.1108/eb051743
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