Tutorial / tips for adapting templates

Is there a guide or tutorial that teaches people to create a pandonc template suitable to use with rmarkdown and possibly to include in rticles? I'm considering writing something but woudln't want to duplicate any existing work.

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Start by reviewing the existing rticles documentation and template materials to determine whether guidance for adapting templates already exists. Done means documenting how to create a pandoc template for use with rmarkdown and potentially rticles without duplicating existing work.