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The medium 1 is labeled epsilon sub 1 and sigma sub 1, and the medium 2 is labeled epsilon sub 2 and sigma sub 2. A northeast vector J sub 1 represents the current density of medium 1 that has a vertical component J sub 1 n and horizontal component J sub 1 t. Another northeast vector J sub 2 represents the current density of medium 2 that has vertical component J sub 2 n and horizontal component J sub 2 t.