## Waveguide H field boundary condition

When solving for the TE field solutions in a rectangular waveguide, the boundary condition $$\frac{\partial H_z}{\partial x}\bigg|_{x=0,a} = 0$$ is used. Where does that come from? Can you get this from the $$\hat n \times [\bar H_1 - \bar H_2] = 0$$ or the one for B-fields? Thank you.

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