  We study the electronic transport through a double quantum dot molecule
attached to leads, and examine the transition from a configuration in series to
a symmetrical parallel geometry. We find that a progressive reduction of the
tunneling through the antibonding state takes place as a result of the
destructive quantum interference between the different pathways through the
molecule. The Fano resonance narrows down, disappearing entirely when the
configuration is totally symmetric, so that only the bonding state participates
of the transmission. In this limit the antibonding state becomes completely
localized.
