Layered morphology

Layered morphology is a term introduced in Simpson &amp; Withgott (1986) to distinguish morphological systems which imply constituent structure from morphological systems which make use of templates (see template morphology). Two major differences between these types of systems are: (a) layered morphology gives rise to headed structures, while template morphology does not; and (b) layered morphology is constrained by some principle of adjacency, while template morphology is not.

Example
English and Dutch have layered morphologies, while Arabic and Navajo have template morphologies.

Link
Utrecht Lexicon of Linguistics