  We examine the impact of non-magnetic disorder on the electronic states of a
multilayer structure comprising layers of both topological and conventional
band insulators. Employing the Burkov-Balents model with renormalized tunneling
parameters, we generate phase diagrams correlating with disorder, demonstrating
that non-magnetic disorder can induce transitions between distinct topological
phases. The subsequent section of our investigation focuses on the scenario
where disorder is unevenly distributed across layers, resulting in fluctuations
of the interlayer tunneling parameter - termed off-diagonal disorder.
Furthermore, we determine the density of states employing the self-consistent
single-site diagram technique, expanding the Green function in relation to the
interlayer tunneling parameter (locator method). Our findings reveal that
off-diagonal disorder engenders delocalized bulk states within the band gap.
The emergence of these states may lead to the breakdown of the anomalous
quantum Hall effect (AQHE) phase, a phenomenon that has garnered significant
attention from researchers in the realm of topological heterostructures.
Nonetheless, our results affirm the stability of the Weyl semimetal phase even
under substantial off-diagonal disorder.
