  We investigate multilayer systems of a normal insulator and a Weyl semimetal.
We calculate the bulk band structure and determine phase diagrams by changing
the thickness of the normal insulator and that of the Weyl semimetal layer
using two models; one is from the effective model for a Weyl semimetal, and the
other is the lattice model. We compare the results between the two models, and
found that they agree well. As a result, we find that the multilayer system
shows a qualitatively different behavior depending on the stacking direction
relative to the displacement vector connecting between two Weyl nodes. When the
stacking direction is perpendicular to the displacement vector, the Weyl
semimetal and the normal insulator phases appear only. On the other hand, when
it is parallel to the displacement vector, the phase diagram is rich,
containing not only the Weyl semimetal phases but also the quantum anomalous
Hall phases with different Chern numbers. Furthermore, the phase transition can
be understood in terms of the trajectory of the Weyl nodes.
