  Using a tight binding model we calculate the conductance of monovalent atomic
chains for different contact geometries. The leads connected to the chains are
modelled as semi-infinite fcc lattices with different orientations and
couplings. Our aim is twofold: To check the validity of a three-parametric
conductance formula for differently oriented leads, and to investigate the
geometry dependence of the conductance oscillations. We show that the character
of these oscillations depends strongly on the geometry of the chain-lead
coupling.
