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2-dimensional(2D)van der Waals homo-/hetero-structures built up from layered semiconducting materials,such as MoS2 and WS2,have received growing attention owing to their simple fabrication of straightforward stacking and various types of band alignments.Optical and electrical properties have been investigated intensively to probe the interlayer coupling in 2D homo-/hetero-structures.The mechanical interlayer interaction,however,has yet to be well studied.