Of course we also have both interaurel cross-correlation or head related (HRTF) time differences (ITD), not just intensity (IID). The cross over happens around 750 Hz. and/or 0.66 milliseconds. With a standard stereophonic loudspeaker arrangement, the lateral localization of the auditory event at Just Noticeable Difference is between 630 microseconds and 1 ms.
There are some good books on the subject, especially “Spatial Hearing” by Blauert.