Thus, continuity of the tangential component of the magnetic field across the boundary requires ˜H1(r0)=˜H2(r0), where \({\bf r}_0\triangleq\hat{\bf x...Thus, continuity of the tangential component of the magnetic field across the boundary requires ˜H1(r0)=˜H2(r0), where r0≜ˆxx+ˆyy since z=0 on the boundary. ˆx⋅˜Ei(r0)+ˆx⋅˜Er(r0)=ˆx⋅˜Et(r0)