The Collaborative International Dictionary of English v.0.48:

layered \layered\ adj.
   arranged in layers.

   Syn: superimposed.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

layered
    adj 1: with one layer on top of another; "superimposed rocks"
           [syn: layered, superimposed]

Moby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "layered":
   filmy, foliaceous, foliated, in layers, lamellar, lamellate,
   lamellated, lamelliform, laminate, laminated, laminous, leaflike,
   leafy, membranous, scummy, spathic, spathose, stratified,
   stratiform, three-ply, two-ply