Is there any difference between these two sentences? I saw both of them in the literature. which one is more formal?

The thickness of each layer is known.

The thickness of each layers is known.


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  • Please see each. – Cascabel Jul 15 '18 at 21:03
  • 1
    There is no question of formality. "… each layers is known" is simply wrong. – Robbie Goodwin Jul 17 '18 at 1:21

Each layer is more formal by way of being correct while "each layers" is incorrect. Each is singular.

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