2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/90721The Marchenko phase-equivalent transformation of the Schrödinger equation for two coupled channels is discussed. The combination of the Marchenko transformations valid in the Bargmann potential case is suggested.LaTex2e, 8 pages, 6 Postscript figures, corrected some typosQuantum Physicstext