  (TMTSF)2ReO4 presents a phase coexistence between two anion orderings defined
by their wave vectors q_2=(1/2,1/2,1/2) and q_3=(0,1/2,1/2) in a wide range of
pressure (8-11kbar) and temperature. From the determination of the anisotropy
of the conductivity and the superconducting transitions in this regime we were
able to extract the texture which results from a self-organization of the
orientations of the ReO4 anions in the sample. At the lowest pressures, the
metallic parts, related to the q_3 order, form droplets elongated along the
a-axis embedded in the semiconducting matrix associated with the q_2 order.
Above 10kbar, filaments along the a-axis extend from one end of the sample to
the other nearly up to the end of the coexistence regime. A mapping of the
system into an anisotropic Ising lattice is satisfactory to analyze the data.
satisfactory to analyze the data.
