Does a MoS₂ thin film exhibit birefringence, and how does this birefringence vary with the number of layers?

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Jürgen Weippert

Yes, it does:

https://www.nature.com/articles/s41467-021-21139-x

Maybe search forward for articles citing this one for more details.

Abdelhak Maghchiche

MoS₂ thin films exhibit birefringence that increases with the number of layers. Multilayer MoS₂ shows higher birefringence than single-layer due to enhanced anisotropy from interlayer coupling and symmetry breaking.