Final answer:
Participant observation is the research technique that would most likely be used by a symbolic interactionist.
Step-by-step explanation:
The research technique that would most likely be used by a symbolic interactionist is Participant observation. This method allows the researcher to observe and interact with individuals or groups in their natural setting, providing a deeper understanding of the meanings and symbols they attach to their actions. Symbolic interactionists focus on the subjective interpretations of individuals and how they create and negotiate meaning through social interactions.