Reset or clear input after change made with another input

I want to clear the input for a radio button after I change the state of another radio button 

Example once I change the state of radio button to Tier 2 Additional Request From I want "What tier outputs does this request cover? " to reset if it was previously selected

a!radioButtonField(
label: "What application are you submitting? ",
labelPosition: "ABOVE",
choiceLabels: {"Tier 1 Service Output Form", "Tier 2 Additional Request Form", "Tier 3 Service Output Form"},
choiceValues: {"Tier 1 Service Output Form", "Tier 2 Additional Request Form", "Tier 3 Service Output Form"},
value: ri!svcRequest.submitted_app_type,
saveInto: ri!svcRequest.submitted_app_type,
required: true,
choiceLayout: "STACKED",
validations: {}
)
a!radioButtonField(
label: "What tier outputs does this request cover? ",
labelPosition: "ABOVE",
choiceLabels: {"1A", "1B"},
choiceValues: {"1A", "1B"},
value: ri!svcRequest.tier_output,
saveInto:ri!svcRequest.tier_output,
required: true,
choiceLayout: "STACKED",
validations: {}
),

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