THESAURUS
assorted, cataloged, classified, even, filed, flat, flattened, flush, graded, grouped, hierarchic, homaloidal, horizontal, indexed, level, on file, pigeonholed, placed, plain, plane, pyramidal, ranked, rated, rolled, smooth, smoothed out, smoothened, sorted, squashed, squashed flat, stratified, tabloid, trodden, trodden flat
ROGET THESAURUS
Layer
N
layer, stratum, strata, course, bed, zone, substratum, substrata, floor, flag, stage, story, tier, slab, escarpment, table, tablet, dess, flagstone, board, plank, trencher, platter, plate, lamina, lamella, sheet, foil, wafer, scale, flake, peel, coat, pellicle, membrane, film, leaf, slice, shive, cut, rasher, shaving, integument, eschar, stratification, scaliness, nest of boxes, coats of an onion, monolayer, bilayer, trilayer, lamellar, lamellated, lamelliform, layered, laminated, laminiferous, micaceous, schistose, schistous, scaly, filmy, membranous, pellicular, flaky, squamous, foliated, foliaceous, stratified, stratiform, tabular, discoid, spathic, spathose, trilamellar, graphitic.