I’m sorry nobody got back to you sooner.
The layer build-up for your board is here: 4 Layers 1.6mm 35µm stackup. It lists track widths for standard single-ended tracks and differential pairs, but not for coplanar structures. If your design depends on a defined impedance, get in touch via support@aisler.net before you order, and we’ll look at what’s possible for you.