You can't really rely on a torque spec because the friction between the stem and steerer varies so much bike to bike (unclamped). Loosen the stem all the way so it slides freely, and tighten the top screw while bouncing the front wheel to listen for looseness, and rotating the fork to check for tightness.
You want zero play of any kind while keeping steering friction near zero. Either play in the fork, or steering drag will make the bike harder to control, so you want to be sure to find the sweet spot. If in doubt a tiny bit tight is better than a tiny bit loose.
When you're done, straighten the handlebars and clamp the stem.
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