Team Structure refers to how a team is organized, both internally and externally:
* What skills do we require internally, and how should we communicate. * What requirements do we have, and who has to be involved in each. * What teams do we interact with, and what itnerfaces do we want to expose to those teams.
Frameworks like Team Topologies 
or Pioneers, Settlers and Town Planners can inform the **external** structure of the team based on the function, or state of maturity of the work required.
The internal structure also needs careful consideration. First is to Know What Type of Team You Are Building. Understand what types of activities your team requires and what roles you have in the team and decide who focuses on what , and who decides through Delegation.
Consider the complex relationships that make a good team.