Stratificational Phonology

definitions form David Crystal, A Dictionary of Linguistics & Phonetics:
Stratificational grammar
A linguistic theory devised y the American linguist Sydney M. Lamb (b. 1929), as expounded initially in Outline of Stratificational Grammar (1962), which models language as a system of several related layers (or strata) of structure. Six strata are recognized for English and many other languages: the component of phonology comprises the hypophonemic (or phonetic) and phonemic strata; and semology comprises the sememic and hypersememic (or semantic) strata. Each stratum is organized in terms of a set of stratal systems, and each system deals with an aspect of linguistic structure which has to be stated independently of the structures operating at other strata. Two types of patterning are recognized: tactic analysis (the patternss of sequential arrangement within each stratum) and realizational analysis (the relationship between units operating at higher and lower levels between strata). A parallel terminology is used sememic/hypersememic’ system consisting of various structural patterns (e.g. ‘hypophonotactic/phonotactic’, etc.), defined in terms of ‘hypophonemes/phonemes’, etc., and realized as ‘hypophons/phons/morphos/lexons’,etc.

Stratificational Linguistics is a view of linguistics advocated by Sydney Lamb. His theories advocate that language usage and production is stratificational in nature.
Specifically, that there are separate 'strata' or levels in the brain used for language. Each level provides actualization or 'realization' for the next higher level, and the elements on its level are similar to each other. Several strata are involved in the production of a sound from an initial idea.
Some strata include:
Phoneme as the unit on the Phonemic strata.
Lexeme as a unit on the Lexical strata.
Morpheme as the unit on the Morphemic strata
Sememe as the unit on the Semantic strata.

(go to the page of FJU)

stratificational phonology in An Introduction to Phonetics and Phonology

作者：John Clark, Colin Yallop, Janet Fletcher

stratificational phonology in A dictionary of Phonetics and Phonology

作者：Robert Lawrence Trask