3-layers structure / 3-layer structure

Doc09

New Member
French
Should we say: a "3-layers structure" or a "3-layer structure"?

Thanks in advance

Pierre
 
  • bibliolept

    Senior Member
    AE, Español
    Welcome, Doc09.

    Can you tell us which you think is correct? Also, it would help us to be sure of our answer if you give us a full sentence and possibly explain where you found this phrase.
     

    Doc09

    New Member
    French
    Hi bibliolept,

    Thanks

    This is a sentence that I am trying to write. It is about magnetism.

    Somebody explained me that I should write "a 3-layer structure" but I don't know the rule.

    Sincerely

    Doc09
     
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