One layer, two layers, gap is gap. When the filament is extruded, there’s nothing below to support it and you get a spaghetti layer. The orientation of the extrusion might help, but I would be surprised if it helped enough. You need supports. If you’re printing in PLA, PETG will work and it will not stick even with the interface spacing set at 0.
Does the slicer identify that area as a “bridge”? if so, take a look at the bridging parameters in the slicer. A different extrusion speed or a higher part fan speed might help. But you’re never going to get it as good as it can be without supports.