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A one-dimensional wall is one in which the magnetization does not vary throughout the thickness of the ferromagnetic film nor along the length of the wall. There are three types of one dimensional walls: Bloch, Néel, and intermediate. The results of calculations of the structure, width, and type of walls as a function of film thickness and wall angle are discussed. The Néel wall width is inversely proportional to wall angle and to film thickness plus a constant. The Bloch wall width is proportional to the square root of film thickness plus a constant. The transition between Néel and intermediate walls is marked by an abrupt change of slope in the hard-axis hysteresis loop.