I am working on the below problem: "A region shown below contains a perfect conducting half-space and air. The surface current Ks on the surface of the perfect conductor is Ks= 2 amperes/metre in direction of +ve x-axis amperes per meter. The tangential H field in the air just above the perfect conductor is ?"
Now, since we have , here H2 =0 and an12 should be unit vector in direction of -y axis. In that case, the answer comes out to be 2 amperes/metre in direction of +ve x-axis, however, the answer is 2 amperes/metre in direction of +ve z-axis. Can anyone please explain?