Where can we see the unit multipliers? Say for ex: skirmisher has "Attack bonus vs. archers"?
there is no multipliers but +x attack. there is many stat sites and wikies and workshop mod for bonusses
http://aoe2sheet.info and http://aoe2stats.net are good resources for this.
I think it would be better if this was available in-game.
If you check the link at http://aoe2sheet.info/ you will also find a steam workshop mod.