"expand the depth" is correct and usable in written English.
You can use it when referring to the need to add more content or detail to something. For example, "We need to expand the depth of our research into this topic."
Stop demanding that film-makers try to expand the depth of your character beyond 'broodmare'broodmare
The plan is one of a batch of measures being considered by Congress that would expand the depth of Medicare's coverage.
Together, Columbia and Cornell aim to expand the depth and breadth of our research collections by identifying areas of unnecessary duplication and redirecting resources toward acquiring additional materials.
The National Transportation Safety Board's recommendations for minimizing the risk of a fuel tank explosion similar to the T.W.A. Flight 800 tragedy would expand the depth and reach of corrective measures undertaken by Boeing and the Federal Aviation Administration.
Companies that expand the depth and breadth of their digital footprint to make strong first impressions will be able to capitalize on the opportunities inherent in customers' new digital behavior.
This finding is consistent with financial development theory (Levine 2005), which suggests that financial innovations such as mobile money expand the depth and breadth of financial intermediation.
At the same time, cell phone and computer users are also expanding the depth and reach of their online activity.
"We believe this transaction further solidifies our position as one of the largest loan managers in the world and expands the depth and diversity of our product offerings".
CEAS continues to work with the University on expanding the depth of East Asian Studies and remains committed to the further development of Korean Studies at Yale.
A better set of solutions, he suggests, would start with expanding the depth and scope of relations between civilians and military personnel.
Enhance Action Learning: By leveraging connections with corporations and alumni in the Latin America region, the MSLAO is expanding the depth and breadth of MIT Sloan's signature action learning programs.
