The Chimera stereo parameters are shown using menu Tools / Viewing Controls / Camera.  You will see "eye separation", "distance to screen" and "screen width".  These are used to determine the parallax between the left and right eye images.  The default eye separation is 2 inches and default distance to screen is 24 inches, making the default rotation about 4.78 degrees (= 2*atan(1/24)).  Chimera does not simply rotate the view -- that is a cheap trick for making a stereo pair.  It actually uses a different camera view point projecting onto the same plane.  (Rotation doesn't do the projection onto the same plane, instead using a rotated plane, which produces a slightly different appearance, usually perfectly acceptable.)

Tom