Two arguments have been advanced in this paper by spreading the "theorem of interchange between magnetization direction and magnetic field component direction" to non-uniform magnetization. The component in any direction of the total field intensity figured out from the single horizon is called component of single-layer field intensity. The even horizon in a broad sense is just the component of single layer field intensity.
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ZHANG Qing-he, CAI Zong-xi. TWO NOTES FOR THE THEORY OF POTENTIAL FIELD ON CURVED FACE. Geophysical and Geochemical Exploration, 2006, 30(5): 453-455.
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