  We consider dipolar interactions between heteronuclear molecules in a
low-dimensional setup consisting of two one-dimensional tubes. We demonstrate
that attraction between molecules in different tubes can overcome intratube
repulsion and complexes with several molecules in the same tube are stable. In
situ detection schemes of the few-body complexes are proposed. We discuss
extensions to the case of many tubes and layers, and outline the implications
of our results on many-body physics.
