The electronic properties of the stage-2 IBr graphite intercalation compound were investigated by means of the de Haas-van Alphen (dHvA) effect. Thirty dHvA frequencies were found with the magnetic field parallel to the c-axis. These results are explained by the Fermi surface model formed by zone folding resulting from commensurate ( √ 183R26.33 • × 2 √ 3R0 • ) in-plane superlattice translations which coupled carrier orbits. The unfolded Fermi surface was the primitive two-dimensional Fermi surface of Blinowski et al for graphite intercalation compounds. By adjusting the dimensions of this Fermi surface, all the dHvA frequencies were interpreted with an accuracy of ≈5%. The Fermi radii of the unfolded Fermi surface were k 1 = 0.118 Å−1 and k 2 = 0.183 Å−1 . The dHvA frequencies (455 and 1106 T) were used to determine the band parameters γ 0 (the interaction of nearest neighbours) and γ 1 (the interaction of nearest layers) in Blinowski's theoretical band model for acceptor-type graphite intercalation compounds.

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