Figure 3: Open Boundary Builder dialog.
The Layers edit box denotes the number of layers in the IABC. In general, the more layers,
the more accurate the boundary condition. The specified number of layers can be any
integer between 1 and 10. The wizard defaults to 7 layers, implying that the boundary will
exactly match the impedance of an unbounded space for up to the 7thspatial harmonic of the
magnetic field.