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A well-known approach to managing and controlling workflows in organizations is the workflow management system (WFMS). Recently, approaches utilizing augmented reality headsets as WFMS front ends have been discussed, promising higher efficiency, effectiveness, and usability for certain application scenarios. However, existing design-oriented approaches lack actionable guidance for implementation. A well-known approach to address such knowledge gaps is a reference architecture, which inter alia reduces development times and risks and facilitates collaboration between developers. Based on an existing tentative design theory for an augmented reality-based WFMS front end, we contribute a reference architecture containing an extended design theory, user interface design, and models for use cases, components, classes, and sequence flows in the unified modeling language. The reference architecture was successfully operationalized in a prototype and positively evaluated via a survey of potential users.