Is it possible to measure ocean surface slopes with a microwave radar at nadir probing?

Karaev, V.Y.; Kanevsky, M.B.; Cotton, P.D.; Challenor, P.G. 2002 Is it possible to measure ocean surface slopes with a microwave radar at nadir probing? International Journal of Remote Sensing, 23 (16). 3251-3262. https://doi.org/10.1080/01431160110114970