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tokens: We are very grateful to an anonymous referee for a careful reading and constructive comments that helped us improve the clarity of the paper. We thank B-G Andersson for sending us a reference on graphene magnetism by hydrogen adsorption. We thank Bruce Draine, Alex Lazarian, Peter Martin, and Charles Telesco for insightful discussions at the initial stage of this work. Numerical calculations were conducted using a high-performance computing cluster at the Korea Astronomy and Space Science Institute (KASI).