We want both matte and glossy reflections here, so make the Specular matte with a Roughness of 0.300. By changing the Anisotropy to 0.900 and Rotation to 0.500, we create elongated reflections.

If this graphical abstract idea catches on perhaps it will force us to put a lot of thought into making that key figure. I hope other journals start offering this because I'd like to do it for the ...