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The 110 planar defect formed in the Cu-Al-Sc 1/1 approximant has been studied by means of electron microscopy and 6-dimensional analysis. As the displacement vector of the planar defect, 1/2 <τ, 1/τ, 0> has been proposed. Here τ denotes the golden ratio. This vector corresponds to a 6-dimensional translation of type  and also to the c-linkage of Tsai-type clusters. An atomic structure model of the planar defect has been constructed referring to the structural properties of the regulararXiv:2108.03341v2 fatcat:z667ezuc5vaeph4bcd5tg5zney