  Interlayer tunneling in graphite mesa-type structures is studied at a strong
in-plane magnetic field $H$ up to 55 T and low temperature $T=1.4$ K. The
tunneling spectrum $dI/dV$ vs. $V$ has a pronounced peak at a finite voltage
$V_0$. The peak position $V_0$ increases linearly with $H$. To explain the
experiment, we develop a theoretical model of graphite in the crossed electric
$E$ and magnetic $H$ fields. When the fields satisfy the resonant condition
$E=vH$, where $v$ is the velocity of the two-dimensional Dirac electrons in
graphene, the wave functions delocalize and give rise to the peak in the
tunneling spectrum observed in the experiment.
