A Superstrate subnode is automatically added by default to the Far-Field Domain, Inhomogeneous node to select the superstrate domain or domain group of the structure. All of the domains in the geometry are automatically selected by default and the selection cannot be modified. The domains that are not in the selection of the Electromagnetic Waves, Frequency Domain interface, they appear as not applicable. The superstrate domain or domain group should must have homogeneous material properties.