Final answer:
A symbolic interactionist would most likely use participant observation as a research technique to deeply understand social interactions and the meanings behind them.
Step-by-step explanation:
The research technique that would most likely be used by a symbolic interactionist is participant observation. Symbolic interactionism is a sociological perspective that focuses on how individuals interact with each other and create symbolic meanings that influence their thoughts, feelings, and actions. Through participant observation, researchers immerse themselves in the social setting they are studying to experience and understand the complex web of social interactions and the meanings that individuals attribute to these interactions.