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We have used the photoacoustic technique in an open photoacoustic cell configuration to measure the thermal diffusivity of conducting polypyrrole films. The samples were obtained by electrochemical deposition from solutions of pyrrole dissolved in 0.08 M p‐toluene sulfonic acid and their thicknesses were in the 50–125 μm range. The thermal diffusivity α was found to be very dependent on the synthesis conditions. © 1996 American Institute of Physics.