There is not a definite minimum requirement specified in the installation guides for a minimum distance required between the bottom of the cook top and the top of the wall oven. Based on the counter height and cut-out requirements, there will likely be close to 1" of clearance between the bottom of the cook top and the top of the front of the oven where it fits into the cut-out. The back of the top panel of the oven cavity tapers down so that there will be more clearance at the middle and back of the cook top. The counter height must be at least 36". The maximum height from the floor for the bottom of the cut-out must be 4.5". The height of the front of the oven cavity that fits into the cut-out is 27 3/16". The height of the cook top is listed at 3.5". The minimum counter height of 36" minus the 4.5", 27 3/16" and 3.5" leaves about 13/16" of clearance. According to the installation guide for the oven, this should be appropriate. As noted above, there will be more clearance in the middle and the back of the oven.
Here are the links for the installation guides for the oven and the cook top:
Oven Installation Instructions
Cook Top Installation Instructions