When the second verbal group in the series is non-finite, the relationship is one of modification of a Head (referred to as hypotactic) and the α β notation you have met for relations within a group is used to show relations between groups:
One very common type of hypotactic verbal group complex is used to show that Agents have been added to the clause; note that these ‘causative’ complexes are discontinuous (e.g. forced... to be below):
To be clear, although not indicated above, the feature 'hypotaxis' is the entry condition to a vast array of relations between verbal groups in verbal group complexes, as shown by the network in Halliday & Matthiessen (2014: 589):
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