Illustration of notations. The z axis is chosen perpendicular to the surface, and the (xz) plane is chosen parallel to the magnetic field lines, which make an angle θB with the normal to the surface. The direction of the reflected beam with wave vector kr is determined by the polar angle θk and the azimuthal angle ϕ, and αr is the angle between the reflected beam and the field lines. Thick solid lines show the reflected beam and magnetic field directions, thin solid lines illustrate the coordinates, and dashed lines show the incident photon wave vector ki and its quadrant. The lines marked illustrate the basic polarizations adopted for the description of reflectivities: and are perpendicular to the wave vectors ki and ki, respectively; are parallel to the surface, and lie in the perpendicular plane. The axes x′ and y′ lie in the plane made by and , x′ being aligned in the plane made by B and kr.
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