Fig. 3: Frequency and amplitude of SdH oscillations as a function of energy (E = 0 corresponds to the expected Fermi level for undoped system), results were obtained by a Fourier transform in the interval 0.2 < B < 5 T for a 30+1+30 system.
From: Electronic properties of stacking faults in Bernal graphite

The black line corresponds to the area of the red Fermi contour when it is closed. Insets show the Fermi contours at energies − 2, 0, 2 meV respectively. We observe that a SdH signal survives even in the regime when the states localized on the stacking fault do not form a closed Fermi contour: scattering to the bulk hole bands and back helps to close the path.