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Ba
3
Cu
2
O
4
Cl
2
has folded chains and orders antiferromagnetically with a field induced spin reorientation transition [M. Wolf et al., JMMM 196-197, 579 (1999)]. The LDA band structure shown on the next transparencies reveals, that the strongest coupling is not along but perpendicular to the chains in y-direction. There is nearly no hopping in z-direction.
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