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Quantum corrections to charge transport can give rise to an oscillatorymagnetoconductance, typically observed in mesoscopic samples with a lengthshorter than or comparable with the phase coherence length. Here, we report theobservation of magnetoconductance oscillations periodic in magnetic field withan amplitude of the order of $e^2/h$ in macroscopic samples of Highly OrientedPyrolytic Graphite (HOPG). The observed effect emerges when all carriers areconfined to their lowest Landau levels. We argue that this quantum interferencephenomenon can be explained by invoking moir\'e superlattices with a discretedistribution in periodicity. According to our results, when the magnetic length$\ell_B$, the Fermi wave length $\lambda_F$ and the length scale offluctuations in local chemical potential are comparable in a layered conductor,quantum corrections can be detected over centimetric length scales.

Quantum interference in a macroscopic van der Waals conductor