  In a normal Fermi liquid, Landau's theory precludes the loss of single
fermion, quantum coherence in the low energy/temperature limit. For highly
anisotropic, strongly correlated metals there is no proof that this remains the
case: we propose that quantum coherence for transport in some directions may be
lost intrinsically. This should stabilize a novel, qualitatively anisotropic
non-Fermi liquid, separated by a novel zero temperature, quantum phase
transition from the Fermi liquid state and categorized by the unobservability
of certain interference effects. There is compelling experimental evidence for
this transition as a function of magnetic field in the metallic phase of the
organic conductor (TMTSF)_2PF_6.
