Halliday & Matthiessen (2014: 92):
… if a clause is organised into two information units, the boundary between the two is overwhelmingly likely to coincide with the junction of Theme and Rheme.
Blogger Comment:
This might be true if we ignore conjunctive Adjuncts as textual Themes and comment Adjuncts as interpersonal Themes:
// However // information boundaries are highly likely between textual and experiential Themes //
// Actually // information boundaries are highly likely between interpersonal and experiential Themes //