Cal. Elec. Code § 9069
When the Secretary of State has received the arguments that will be printed in the state voter information guide, the Secretary of State, within five days of receipt of the arguments, shall send copies of the arguments in favor of the proposition to the authors of the arguments against and copies of the arguments against to the authors of the arguments in favor. The authors may prepare and submit rebuttal arguments not exceeding 250 words, or may authorize in writing another person or persons to prepare, submit, or sign the rebuttal argument. The rebuttal arguments shall be filed with the Secretary of State no later than a date to be designated by the Secretary of State.
Rebuttal arguments shall be printed in the same manner as the direct arguments. Each rebuttal argument shall immediately follow the direct argument that it seeks to rebut.
Ca. Elec. Code § 9069