Dear Pinki .. I think that an important prerequisite for this method is that you have good and large enough single-crystals of your SnTe2 material. For some potentially useful information about growing suitable single-crystals of tin ditelluride please have a look at the following article:

Growth and characterizations of tin telluride (SnTe) single crystals

Article Growth and characterizations of tin telluride (SnTe) single crystals

This paper has been posted by the authors as public full text on RG (please see attached pdf file). For more general information about the exfoliation technique using scotch tape please also see e.g. the following relevant literature references:

A reliable way of mechanical exfoliation of large scale two dimensional materials with high quality

Article A reliable way of mechanical exfoliation of large scale two ...

and

Universal mechanical exfoliation of large-area 2D crystals

Article Universal mechanical exfoliation of large-area 2D crystals

I hope this helps. Good luck with your research and please stay safe and healthy!

Thank you Frank T. Edelmann for providing the useful information.

shake it