Polymerized KC60 was investigated by scanning tunnelling microscopy (S
TM) in ambient atmosphere. Linear polymer fibres were found in both as
-grown and toluene-etched samples with an intermolecular distance arou
nd 9.3 Angstrom. In bundles of polymer fibres the interfibre distance
was found to be 14.7 Angstrom. STM images showing intrafibre and intra
molecular contrasts were taken.