The rule of thirds is a guideline which is used when composing visual images such as films, designs, paintings and photographs.
180-degree rule:
The 180-degree rule is a basic guideline regarding the spacial awareness between 2 characters or objects within a scene. By keeping the camera on one side of an imaginary axis between 2 characters, the first character is always frame right to the second character.
Interview setup:
We used the 180 degree rule to set up our interview. This means that the person we were interviewing was facing the camera so that we could get both the interviewer and interviewee on camera.