Weakly bound states of polar molecules in bilayers
  We investigate a system of two polarized molecules in a layered trap. The molecules reside in adjacent layers and interact purely via the dipole-dipole interaction. We determine the properties of the ground state of the system as a function of the dipole moment and polarization angle. A bound state is always present in the system and in the weak binding limit the bound state extends to a very large distance and shows universal behavior. 
D. V. Fedorov, J. R. Armstrong, N. T. Zinner, A. S. Jensen
physics.atm-clus