  This study delves into the intriguing properties of 1H/1T-TaS$_2$ van der
Waals heterostructure, focusing on the transparency of the 1H layer to the
Charge Density Wave of the underlying 1T layer. Despite the sizable interlayer
separation and metallic nature of the 1H layer, positive bias voltages result
in a pronounced superposition of the 1T charge density wave structure on the 1H
layer. The conventional explanation relying on tunneling effects proves
insufficient. Through a comprehensive investigation combining lowtemperature
scanning tunneling microscopy, scanning tunneling spectroscopy, non-contact
atomic force microscopy, and firstprinciples calculations, we propose an
alternative interpretation. The transparency effect arises from a weak yet
substantial electronic coupling between the 1H and 1T layers, challenging prior
understanding of the system. Our results highlight the critical role played by
interlayer electronic interactions in van der Waals heterostructures to
determine the final ground states of the systems.
