Does β-ET2I3 really have a definite interlayer spacing?

X-ray diffractograms of conducting polycrystalline layers of β-ET2I3 obtained within a surface layer of polycarbonate films show only (001) reflexes thus the comparison with single crystal data is reduced to one parameter — the spacing between the conducting layers. It is shown that β-ET2I3, formed at room temperature, with larger interlayer spacing can be transformed by annealing into the form of smaller interlayer spacing. The difference in interlayer spacing between the two states of β phase is ca 0.07Å.