A technique for communicating in a network management system is disclosed. The data is then \u201ccaught\u201d and stored in a deferred stall register as it is output from a downstream pipeline stage X. The invention enables the determination of pick-up times for process chambers in the cluster tool, and embodiments of the invention allow the creation and maintenance of an updated timetable. In certain example embodiments, a single target may be used to sputter the graded layer including the anti-migration layer portions and the more metallic central portion.