Simple past tense and past participle of layer.(verb)
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Use "layered" in a sentence
"COLLINS: However, you say that the best type of security there is, is what you call layered and redundant."
"Nicodemus is dressed in layered robes of dark reds which cross his chest, around his neck is a silver silken scarf lined with arcane writings."
"(Albert Fert's original article) "Enhanced magnetoresistance in layered magnetic structures with antiferromagnetic interlayer exchange" by G. Binasch et al.,"