  A halo is an intrinsically quantum object defined as a bound state of a
spatial size which extends deeply into the classically forbidden region.
Previously, halos have been observed in bound states of two and less frequently
of three atoms. Here, we propose a realization of halo states containing as
many as six atoms. We report the binding energies, pair correlation functions,
spatial distributions, and sizes of few-body clusters composed by bosonic
dipolar atoms in a bilayer geometry. We find two very distinct halo structures,
for large interlayer separation the halo structure is roughly symmetric and we
discover an unusual highly anisotropic shape of halo states close to the
unbinding threshold. Our results open avenues of using ultracold gases for the
experimental realization of halos with the largest number of atoms ever
predicted before.
