  Van der Waals (vdW) heterostructures continue to attract intense interest as
a route of designing materials with novel properties that cannot be found in
naturally occurring materials. Unfortunately, this approach is currently
limited to only a few layers that can be stacked on top of each other. Here we
report a bulk material consisting of superconducting monolayers interlayered
with monolayers displaying charge density waves (CDW). This bulk vdW
heterostructure is created by phase transition of 1T-TaS2 to 6R at 800 {\deg}C
in an inert atmosphere. Electron microscopy analysis directly shows the
presence of alternating 1T and 1H monolayers within the resulting bulk 6R
phase. Its superconducting transition (Tc) is found at 2.6 K, exceeding the Tc
of the bulk 2H phase of TaS2. The superconducting temperature can be further
increased to 3.6 K by exfoliating 6R-TaS2 and then restacking its layers. Using
first-principles calculations, we argue that the coexistence of
superconductivity and CDW within 6R-TaS2 stems from amalgamation of the
properties of adjacent 1H and 1T monolayers, where the former dominates the
superconducting state and the latter the CDW behavior.
